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MCP3901 Datasheet(PDF) 17 Page - Microchip Technology |
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MCP3901 Datasheet(HTML) 17 Page - Microchip Technology |
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17 / 46 page  MCP3901 AND PIC18F65J90 ENERGY METER REFERENCE DESIGN © 2012 Microchip Technology Inc. DS51968A-page 17 Chapter 3. Calculation Engine and Register Description 3.1 CALCULATION ENGINE SIGNAL FLOW SUMMARY RMS voltage, RMS current, Active Power, Reactive Power and Apparent Power, and the calibration output pulse are all calculated through the following process described in Figure 3-1. The calibration registers for each calculation are shown as well as the output registers. FIGURE 3-1: PIC18F65J90 Calculation Engine Signal Flow X X2 Σ X Σ OFFSET_POWER_ACT: 32 Φ X2 Σ OFFSET_V_RMS: 16 16/24-bit ΔΣ ADC ADC CURRENT Digital to Frequency Converter / Active Power RMS Current RMS Voltage X X X X Apparent Power X X OFFSET_I_RMS: 16 16/24-bit DS ADC X Σ Reactive Power Φ Correction 90° with O FFSET_POWER_REACT:32 ADC Digital to Frequency Converter / VOLTAGE PH ASE_COMPENSATION:8 Σ Σ GAIN_ _90: 8 X COMPENSATION X |
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